利用放电等离子烧结(SPS)及1700℃高温热处理7和17h,研究了组份为R0.33Si9.3Al2.7O1.7N14.3(R=Gd,Y和Er)的α-sialon在4000～1500cm-1(2.5～6.6μm)范围的光学透过率。结果表明,经SPS烧结的样品不但达到致密化,且样品中α-sialon晶粒的尺寸分布均匀。在SPS样品中,以Y2O3掺杂α-sialon的透光性最好。样品厚度为0.5mm时最高透过率达到56％.热处理7h由于第二相的形成导致透过率下降,但合适的热处理条件能提高样品的透过率,例如Gd117的红外最高透过率从SPS后的47%提高到561%.
By spark plasma sintering (SPS) and post-sintering heat treatments at 1700℃ for 7h and 17h
respectively, the optical transmission of R0.33Si9.3Al2.7O1.7N14.3 (R=Gd, Y and Er) in 4000～1500cm-1 (2.5～6.6μm) was studied.
The results indicate that fully densified specimens obtained by SPS are with homogenous distributed α’ grains. Among three SPS-ed specimens, Y
α-sialon ceramic has the highest transmittance and it reaches 56% for the specimen with 0.5mm in thickness. The heat treatment for 7h causes
the decrease in optical transmittance due to the formation of the second crystallized phase in the specimens. The optical
transmittance of specimens can be improved by suitable heat treatment, and the maximum optical transmittance value of Gd117 can be increased from 47% as
SPS-ed to 56% after heat-treated at 1700℃ for 17h.
参考文献
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